StayFasted - Fasting Tracker
AI Fasting Coach & Tracker
Only for iPhone
Free · In‑App Purchases · Designed for iPhone. Not verified for macOS.
iPhone
StayFasted is the fasting app that actually keeps you going.
Most fasting apps give you a timer and a paywall. StayFasted gives you a coach. An AI that reads your mood, your hunger, your energy — and responds with real guidance based on what's happening in your body right now.
LIVE ACTIVITIES & DYNAMIC ISLAND
Your fasting timer lives on your lock screen and Dynamic Island. See elapsed time, current stage, and remaining time — always one glance away. No unlock. No app launch. Just look.
APPLE WATCH APP
Start and stop fasts, log water, and check in with your mood — all from your wrist. Full timer with stage tracking, motivational messages, and haptic feedback.
8-STAGE BODY SCIENCE
Know exactly what's happening inside your body at every hour. From Fed State to Immune Reset, each stage explains the biology, what you might feel, and what to do about it. This isn't a countdown — it's education.
AI COACHING THAT ACTUALLY HELPS
Check in with your mood, hunger, and energy. The AI coach responds with personalized guidance — not generic tips. It knows the difference between hour 4 and hour 40. Built with Apple Intelligence, running 100% on your device.
EVERY FASTING PROTOCOL
16:8 · 18:6 · 20:4 · OMAD · 36h · 48h · 72h · Custom
Schedule your next fast. Set weekly rhythms. Track adherence with a 28-day grid.
HYDRATION & ELECTROLYTES
Track water, coffee, tea, and electrolytes. Barcode scanner for bottled drinks. Daily goal ring. Sodium, potassium, magnesium tracking — because most fasting discomfort is dehydration, not hunger.
REFEED GUIDE
Breaking a fast matters as much as the fast itself. Get recommendations based on your fast duration — what to eat first, what to avoid, and when.
WIDGETS & NOTIFICATIONS
Home screen and lock screen widgets for timer, streak, and next fast. Gamified milestone notifications: "You just entered ketosis" instead of generic reminders.
HEALTH & BODY TRACKING
Apple Health sync for weight, steps, sleep, heart rate, and active calories. Body measurements. Supplement tracker. InBody, DEXA, and blood panel logging with 40+ biomarkers.
ACHIEVEMENTS & PROGRESS
12 milestone badges. Weekly summaries. Progress charts. Streak tracking. CSV export. Fasting journal with photos.
YOUR DATA STAYS ON YOUR DEVICE
No account. No cloud. No tracking. StayFasted runs 100% on-device. Your fasting data, AI conversations, check-in notes, and health metrics exist on your iPhone and nowhere else.
FREE TIER INCLUDES:
- Full fasting timer with all protocols
- 8-stage body science education
- 3 AI coaching check-ins per day
- Hydration tracking
- Live Activities & Dynamic Island
- Home screen & lock screen widgets
PRO UNLOCKS:
- Unlimited AI coaching
- Schedule & rhythm planner
- 28-day adherence grid
- Fasting journal
- Body measurements & supplements
- Analytics & achievements
- Apple Health sync
- Refeed guide
- Barcode scanner
- CSV export
PRO: $5.99/month or $39.99/year
LIFETIME: $49.99 — one payment, yours forever.
Terms of Use (EULA): https://www.apple.com/legal/internet-services/itunes/dev/stdevstandard/
Privacy Policy: https://stayfasted.app/privacy
Ratings & Reviews
- This app hasn’t received enough ratings or reviews to display an overview.
You asked, we built it:
• Metric units: switch to kg, cm and ml in Settings → Units
• Meal Log: track what you eat in your eating window (More → Meal Log)
• Supplements: edit details, undo an accidental "taken" tap, or delete
• Set your own daily water goal
Thanks for the feedback. Keep it coming!
The developer, Jason Duval, indicated that the app’s privacy practices may include handling of data as described below. For more information, see the developer’s privacy policy .
Data Not Linked to You
The following data may be collected but it is not linked to your identity:
- Health & Fitness
- Location
- User Content
Accessibility
The developer has not yet indicated which accessibility features this app supports. Learn More
Information
- Seller
- Jason Duval
- Size
- 5.3 MB
- Category
- Health & Fitness
- Compatibility
Requires iOS 18.0 or later.
- iPhone
Requires iOS 18.0 or later. - Mac
Requires macOS 15.0 or later and a Mac with Apple M1 chip or later. - Apple Vision
Requires visionOS 2.0 or later.
- iPhone
- Languages
- English
- Age Rating
9+
- 9+
- Contains
Health or Wellness Topics
- In-App Purchases
Yes
- Pro Annual $39.99
- Pro Monthly $5.99
- Lifetime Access $49.99
- Copyright
- © 2026 Jason Duval